The biggest myth about "free markets" is that the excel in everything else in "giving us what we want." The other is that "free markets" optimize the efficient use of resources of all kinds. Oh, and they promote human imagination and innovation.
Well, to put it bluntly, bullshit. They excel at giving us what "they" (the owners of production) want us to want from a profit maximizing perspective. They then psychologically engineer, or fool, the masses of people into wanting things they never wanted or needed through the psychological tools of the entertainment and advertising media.
For example, there are literally infinite possible "better mousetrap" alternatives in the world of personal surface transportation - which require no technological breakthroughs, that people would beat a path to. But you will never see such products or services in stores on the streets because they would displace the far more profitable alternatives - and through their social engineering media tools, suppressing the ability to imagine that any alternatives are even possible!